Methods of treating gastrointestinal stromal tumors

ABSTRACT

The present disclosure relates to methods of treating gastrointestinal stromal tumors to a subject in need thereof, comprising administering to the subject a therapeutically effective amount of ripretinib or a pharmaceutically acceptable salt thereof.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. Ser. No. 17/028,640 filed Sep. 22, 2020, which is a continuation of International Application Number PCT/US2020/045876 filed Aug. 12, 2020, which claims priority to U.S. Ser. No. 62/885,797 filed Aug. 12, 2019, U.S. Ser. No. 62/904,198 filed Sep. 23, 2019, U.S. Ser. No. 62/926,281 filed Oct. 25, 2019, U.S. Ser. No. 62/936,018 filed Nov. 15, 2019, U.S. Ser. No. 62/968,927 Jan. 31, 2020, U.S. Ser. No. 62/968,945 filed Jan. 31, 2020, U.S. Ser. No. 63/023,921 filed May 13, 2020, and U.S. Ser. No. 63/023,936 filed May 13, 2020, the contents of each of which are incorporated herein by reference in their entirety.

BACKGROUND

Gastrointestinal stromal tumors (GIST) comprise less than 1% of all gastrointestinal (GI) tumors, but constitute the most common mesenchymal tumors and soft tissue sarcomas of the GI tract. They occur anywhere along the GI tract but are found most often in the stomach (60%) or small intestine (30%) and less frequently in the rectum, colon, or mesentery. In the United States, around 3300 to 6000 new cases of GIST are diagnosed each year. The vast majority of cases are sporadic, and older age is a recognized risk factor. Mutations in KIT and platelet-derived growth factor receptor-alpha (PDGFRA) are found in over 80% of all primary GISTs. Alterations in neurofibromatosis type 1 gene (NF1) and succinate dehydrogenase (SDH) complex (SDHC) genes as well as altered methylation of SDHC promoter have been described as oncogenic drivers in GIST without activating mutations in KIT or PDGFRA, and they have been linked to familial and heritable syndromes (NF1 and Carney-Stratakis syndrome).

Despite a wide variation in tumor size, location, and histologic subtypes (spindle cell, epithelioid cells, and mixed type), approximately 85% of all GISTs share oncogenic mutations in 1 of 2 receptor tyrosine kinases (TKs): KIT or PDGFRA. Constitutive activation of either of these TKs plays a central role in the oncogenic behavior of GIST. The early characterization of GIST mutational status is important in both the localized and metastatic settings to identify imatinib-resistant mutations (such as some primary KIT exon 17 mutations or PDGFRA D842V) or mutations that require a higher dose of imatinib. Patients with GIST lacking KIT or PDGFRA mutations usually do not benefit from imatinib, and standard treatment algorithms mostly do not apply. However, other mutations may be present in these patients, with the largest group represented by SDH-deficiency frequently associated with Carney or Carney-Stratakis-Syndrome. Other subtypes have mutations in NF1 (usually associated with neurofibromatosis type I) or in BRAF or KRAS. Very recently, casuistic cases of GIST-like tumors harboring NTRK translocations have further expanded the spectrum of molecular subtypes.

In the pre-tyrosine kinase inhibitor (TKI) era, GISTs (often categorized as gastric leiomyosarcomas or leiomyoblastomas) were treated within the subtype of agnostic sarcoma trials and lacked an effective systemic therapy. However, a deeper understanding of the molecular pathogenesis and driving role of the protooncogenes KIT and PDGFRA has transformed the treatment of both localized and metastatic diseases. Localized and resectable tumors are treated surgically which remains the mainstay of curative therapy for localized disease. Resected high-risk GIST is typically treated with adjuvant imatinib, whereas low-risk GIST is managed with surgery alone. Intermediate-risk GIST is managed on a per-case basis. In an advanced/metastatic setting, imatinib 400 mg daily is approved, with dose escalation to 800 mg at the time of progression, and has been shown to yield dramatic results in disease control. Imatinib-refractory patients are treated with sunitinib as a second-line therapy and regorafenib as third-line therapy on resistance or intolerance to sunitinib.

At diagnosis, a mutation in the KIT gene occurs in 80% of GISTs and is usually found in exon 11, and less commonly in exon 9. Both mechanisms cause ligand-independent receptor activation, which leads to uncontrolled cell growth and transformation. Primary mutations affect a loss-of-function mutation in the JM domain and lead to a shift in equilibrium toward a Type I active or on-state conformation of KIT and away from a Type II inactive or off-state conformation of KIT. Exon 11 primary mutations are the most commonly seen in GISTs (around 70% of cases), and derive significant benefit from treatment with imatinib in both the adjuvant and metastatic settings, achieving a 2-year relapse-free survival of ˜90% in the adjuvant setting, and a median event-free survival just under 2 years in the metastatic setting. Primary mutations (in treatment-naïve patients) in exon 9 affect the extracellular domain of KIT, mimicking conformational changes induced by ligand binding and triggering KIT receptor homodimerization. This dimerization leads to the activation of specific intracellular signaling pathways which can lead to cancer cell proliferation, survival, and resistance. Although less common than exon 11 mutations, exon 9 mutations (10%-15% of newly diagnosed cases) are most commonly seen in GISTs arising from the small intestine. Unlike exon 11 mutations, they benefit less from imatinib in both the adjuvant and metastatic settings.

Despite significant improvement in outcomes compared with those in the pre-mutation-driven/TKI therapy era, response to imatinib is not experienced by all patients, and most patients with GIST will ultimately develop resistance to imatinib, most commonly due to the development of secondary mutations in KIT. Secondary resistance mutations usually arise in the catalytic domain of the kinase: 1) at the switch pocket, which typically occur in KIT exons 13 and 14 or PDGFRA exons 14 and 15 and sterically disrupt drug binding or conformationally activate KIT, and 2) in the activation loop switch encoded by KIT exons 17 and 18 and PDGFRA 18. Activation loop mutations act by shifting the kinase into an activated Type I or on-state conformation that is less amenable to drug binding by any of the approved Type II TKIs. Although uncommon in primary GIST (1%-2% of newly diagnosed cases), mutations in exons 13, 14 and 17 are often responsible for acquired imatinib resistance, with exon 17 mutations alone accounting for as many as 50% of the acquired resistance cases to imatinib, and later to sunitinib. A need exists for a TKI that can broadly inhibit clinically relevant KIT and PDGFRA mutations.

SUMMARY

Described herein are methods of treating a gastrointestinal stromal tumor in a patient in need thereof comprising administering to the patient a therapeutically effective amount of ripretinib or a pharmaceutically acceptable salt thereof.

For example, in one embodiment described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg to 300 mg, e.g., 150 mg, of ripretinib daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib.

For example, in one embodiment described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg to 250 mg, e.g., 150 mg, of ripretinib daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg to 600 mg, e.g., 100 mg to 250 mg, e.g., 150 mg, of ripretinib daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient one or more tablets comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib. In some examples, the tablets comprise 50 mg of ripretinib. In some embodiments, the tablets comprise 75 mg of ripretinib. In some embodiments, the tablets comprise 100 mg of ripretinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient one or more tablets comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib, a previous second line administration of sunitinib, and a previous third line administration of regorafenib or wherein the patient has a documented intolerance to one or more of imatinib, sunitinib and/or regorafenib. In some embodiments, the tablets comprise 50 mg of ripretinib. In some example, the tablets comprise 75 mg of ripretinib. In some example, the tablets comprise 100 mg of ripretinib. In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg to 250 mg of ripretinib daily, e.g., 150 mg, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib or wherein the patient has a documented intolerance to one or more of imatinib, sunitinib and/or regorafenib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg to 600 mg of ripretinib daily, e.g., 100 mg to 250 mg, e.g., 100 mg to 500 mg, e.g., 100 mg to 250 mg, e.g., 150 mg, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib or wherein the patient has a documented intolerance to one or more of imatinib, sunitinib and/or regorafenib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient to the patient, on a daily basis, one or more tablets each comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib or wherein the patient has a documented intolerance to one or more of imatinib, sunitinib and/or regorafenib. In some embodiment, the tablets comprise 50 mg of ripretinib. In some embodiment, the tablets comprise 75 mg of ripretinib. In some embodiment, the tablets comprise 100 mg of ripretinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg to 600 mg of ripretinib daily, e.g., 100 mg to 250 mg, e.g., 100 mg to 500 mg, e.g., 100 mg to 250 mg, e.g., 150 mg, e.g., 300 mg, wherein the patient was previously administered at least two tyrosine kinase inhibitors before administration of the ripretinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg of ripretinib once daily, wherein the patient was previously administered at least two tyrosine kinase inhibitors before administration of the ripretinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient, on a daily basis, one or more tablets each comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, wherein the patient was previously administered at least two tyrosine kinase inhibitors before administration of the ripretinib. In some embodiment, the tablets comprise 50 mg of ripretinib. In some embodiment, the tablets comprise 75 mg of ripretinib. In some embodiment, the tablets comprise 100 mg of ripretinib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg of ripretinib once daily, wherein the patient was previously administered three or more kinase inhibitors before administration of the ripretinib. In some embodiments, after at least 4 weeks of the daily ripretinib administration, the patient has at least a 5-month progression-free survival as measured using mRECIST v1.1. In some embodiments, orally administering to the patient 150 mg of ripretinib once daily comprises administering to the patient three tablets each tablet comprising 50 mg of ripretinib. In some embodiments, one of the three or more kinase inhibitors is imatinib. In some embodiments, the patient was previously administered imatinib, sunitinib and regorafenib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg daily ripretinib, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg of ripretinib once or twice daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib.

In another embodiment, described herein is a method for achieving at least 5 months of progression free survival as determined by mRECIST 1.1 in a patient having an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100, 150 200, or 300 mg of ripretinib daily or twice daily for at least 28 days.

In another embodiment, described herein is a method for achieving at least 5 months of progression free survival as determined by mRECIST 1.1 in a patient having an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100, 150, or 200 mg of ripretinib daily or twice daily for at least 28 days.

In another embodiment, descried herein is a method of treating a patient suffering from Grade 3 palmer-plantar erythrodysesthesia syndrome while being administered 150 mg ripretinib daily or twice daily, comprising withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantarplantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days.

In another embodiment, descried herein is a method of treating a patient suffering from Grade 2 palmer-plantar erythrodysesthesia syndrome upon administration of 150 mg ripretinib daily or twice daily, comprising a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; b) if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib or c) if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days.

In another embodiment, described herein is a method of treating a gastrointestinal stromal tumor in a patient in need thereof, wherein the patient is being treated concurrently with a CYP3A4 inhibitor, the method comprising: orally administering to the patient 100 mg or 150 mg of ripretinib, or a pharmaceutically acceptable salt thereof, once or twice daily, and wherein upon administration of the ripretinib and the CYP3A4 inhibitor, provides an increased ripretinib area under the plasma concentration curve (AUC_(0-inf)) of 80% or more in the patient as compared to administration of ripretinib without concurrent treatment of the CYP3A4 inhibitor, and therefore the patient is at higher risk of an adverse event; and monitoring the patient more frequently, as compared to a patient not being treated with a CYP3A4 inhibitor, for the adverse event.

In another embodiment, described herein is a method of treating a gastrointestinal stromal tumor in a patient in need thereof, wherein the patient is being treated concurrently with a proton pump inhibitor, the method comprising: orally administering to the patient 100 mg or 150 mg of ripretinib, or a pharmaceutically acceptable salt thereof, once or twice daily, and wherein administration of the ripretinib and proton pump inhibitor to the patient provides no clinically significant difference in the plasma exposure of ripretinib in the patient as compared to administration of ripretinib without concurrent treatment of the proton pump inhibitor.

In another embodiment, described herein is a method of treating a gastrointestinal stromal tumor in a patient in need thereof, the method comprising orally administering to the patient 100 mg or 150 mg of ripretinib, or a pharmaceutically acceptable salt thereof, once or twice daily, wherein the ripretinib is administered to the patient with food or without food.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts a plot of survival probability with respect to progression-free survival (PFS) for patients on ripretinib and patients on placebo as described in Example 2.

FIG. 2 depicts a plot of survival probability with respect to overall survival (OS) for patients on ripretinib and patients on placebo as described in Example 2.

FIG. 3 depicts plots illustrating survival probability with respect to OS in patients on ripretinib, crossed over from placebo to ripretinib, and patients without cross-over.

FIG. 4 depicts PFS by line of therapy for patients with GIST treated with 150 mg once daily of ripretinib.

FIG. 5A, FIG. 5B, and FIG. 5C depict patient report outcome by EQ-VAS visual scale (FIG. 5A) and score changes from baseline (FIG. 5B) used to assess these scores and corresponding patient percentage distributions (FIG. 5C) used in the study of Example 2 at 150 mg ripretinib QD. In the study, 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 6A, FIG. 6B, and FIG. 6C depict EORTC QLQ-C30 physical function questions (FIG. 6A) and patient score changes (FIG. 6B) from baseline in response and corresponding patient percentage distributions (FIG. 6C) used in the study of Example 2 at 150 mg ripretinib QD. Physical function scores improved on average 1.6 from baseline to C2D1 among patients taking ripretinib in contrast to placebo patients who saw on average, a decline from baseline to C2D1 of 8.9 (p=0.004). In this study, 71 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 7A, FIG. 7B, and FIG. 7C depict EORTC QLQ-C30 role function questions (FIG. 7A) and patient score changes (FIG. 7B) from baseline in response and corresponding patient percentage distributions (FIG. 7C) used in the study of Example 2 at 150 mg ripretinib QD. In the study, 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 8A and FIG. 8B depict patient score changes from baseline (FIG. 8A) and percentage distributions (FIG. 8B) in response to Question C29 of EORTC QLQ-C30 (“How would you rate your overall health during the past week?”) from a scale of 1 (“Very poor”) to 7 (“Excellent”) in the study of Example 2 at 150 mg ripretinib QD. In the study, 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 9A and FIG. 9B depict patient score changes from baseline (FIG. 9A) and corresponding patient percentage distributions (FIG. 9B) in response to Question C30 of EORTC QLQ-C30 (“How would you rate your overall quality of life during the past week?”) from a scale of 1 (“Very poor”) to 7 (“Excellent”) in the study of Example 2 at 150 mg ripretinib QD. In the study, 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 10 depicts mean changes in baseline scores in EQ-VAS across various time points, from Cycle 1, Day 15 up to Cycle 15, Day 1 of the intention-to-treat population in the study of Example 2 at 150 mg ripretinib QD.

FIG. 11A and FIG. 11B depict mean changes in baseline scores in EORTC QLQ-C30 role function and EORTC QLQ-C30 physical function, respectively, across various time points, from Cycle 1, Day 15 up to Cycle 15, Day 1 of the intention-to-treat population in the study of Example 2 at 150 mg ripretinib QD.

FIG. 12A and FIG. 12B depict mean changes in baseline scores in EORTC QLQ-C30 question C29 response and EORTC QLQ-C30 question C30 response, respectively, across various time points, from Cycle 1, Day 15 up to Cycle 15, Day 1 of the intention-to-treat population in the study of Example 2 at 150 mg ripretinib QD.

FIG. 13 depicts exemplary PFS data for patients who crossed over from placebo to ripretinib in the study described in Example 2 at 150 mg ripretinib QD.

FIG. 14A and FIG. 14B depict progression free survival (PFS) studies in the double-blind and open-label periods in the study of Example 2 for patients who dose escalated from 150 mg ripretinib QD 150 mg ripretinib BID. FIG. 14C depicting median PFS data and other parameters in these PFS studies.

FIG. 15 shows exemplary PFS data among patients with wild-type KIT mutations in the study of Example 2.

FIGS. 16A and 16B depict Progression free survival (PFS) and overall survival (OS) data based on patients with a primary Exon 11 mutation or those with a non-Exon 11 mutation in the study of Example 2 at 150 mg ripretinib QD.

FIGS. 17A and 17B depicts progression free survival (PFS) and overall survival (OS) data based on patients with a primary Exon 11 mutation or a primary Exon 9 mutation in the study of Example 2 at 150 mg ripretinib QD.

FIGS. 18A and 18B depicts progression free survival (PFS) and overall survival (OS) data based on patients with a primary Exon 11 mutation, or a primary Exon 9 mutation, or another mutation, or wild type (KIT and PDGFRA) in the study of Example 2 at 150 mg ripretinib QD.

FIGS. 19A and 19B depicts progression free survival (PFS) studies for patients with certain primary mutations (Exon 9 or Exon 11) who dose escalated from 150 mg QD ripretinib to 150 mg BID ripretinib for the double-blind and open-label periods, respectively, in the study of Example 2.

FIG. 20 shows exemplary progression free survival data for patients with other KIT mutations and PGDFR mutations in the study of Example 2 at 150 mg ripretinib QD.

FIG. 21 depicts the median first appearance and worst grade of alopecia and PPES in corresponding patients receiving ripretinib in the study described in Example 2.

FIG. 22A depicts a mean change from baseline for physical function patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without alopecia, in the study described in Example 2. FIG. 22B depicts a mean change from baseline for role function patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without alopecia, in the study described in Example 2. FIG. 22C depicts a mean change from baseline for physical function patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without palmar-plantar erythrodysesthesia syndrome (PPES), in the study described in Example 2. FIG. 22D depicts a mean change from baseline for role function patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without palmar-plantar erythrodysesthesia syndrome (PPES), in the study described in Example 2.

FIG. 23A depicts a mean change from baseline for overall health patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without alopecia, in the study described in Example 2. FIG. 23B depicts a mean change from baseline for overall quality of life patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without alopecia, in the study described in Example 2. FIG. 23C depicts a mean change from baseline for overall health patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without palmar-plantar erythrodysesthesia syndrome (PPES), in the study described in Example 2. FIG. 23D depicts a mean change from baseline for overall quality of life patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without palmar-plantar erythrodysesthesia syndrome (PPES), in the study described in Example 2.

FIG. 24A depicts a mean change from baseline for state of health (VAS) patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without alopecia, in the study described in Example 2. FIG. 24B depicts a mean change from baseline for state of health (VAS) patient reported outcome of the EORTC-QLQ-C30 in patients receiving ripretinib, with and without palmar-plantar erythrodysesthesia syndrome (PPES), in the study described in Example 2.

FIG. 25A and FIG. 25B depict exemplary PFS of subjects who dose escalated to 150 mg BID, PFS before (PFS1) and after (PFS2) dose escalation.

FIG. 26A-D depicts an exemplary comparison of PFS of patient subgroups with Exon 9 (FIG. 26A), Exon 11 (FIG. 26B), Exon 13 (FIG. 26C), or Exon 17 (FIG. 26D) KIT mutations. This exemplary data show that ripretinib showed PFS benefit in all assessed patient subgroups compared to placebo.

FIG. 27 shows PFS data of exemplary second and third-line patients with Exons 9, 11, 13, or 17 KIT mutations. The data show that, in second and third line populations, patients with such various KIT mutations have comparable PFS.

DETAILED DESCRIPTION

The features and other details of the disclosure will now be more particularly described. Certain terms employed in the specification, examples and appended claims are collected here. These definitions should be read in light of the remainder of the disclosure and as understood by a person of skill in the art. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by a person of ordinary skill in the art.

Definitions

As used herein, “ripretinib” is a compound represented by the following structure:

As used herein, “sunitinib” is a compound represented by the following structure:

As used herein, “imatinib” is a compound represented by the following structure:

As used herein, “regorafenib” is a compound represented by the following structure:

As used herein, “Compound A” is a compound represented by the following structure:

“Individual,” “patient,” or “subject” are used interchangeably herein and include any animal, including mammals, including mice, rats, other rodents, rabbits, dogs, cats, swine, cattle, sheep, horses, or primates, and humans. The compounds described herein can be administered to a mammal, such as a human, but can also be administered to other mammals such as an animal in need of veterinary treatment, e.g., domestic animals (e.g., dogs, cats, and the like), farm animals (e.g., cows, sheep, pigs, horses, and the like) and laboratory animals (e.g., rats, mice, guinea pigs, and the like). The mammal treated in the methods described herein is desirably a mammal in which treatment of a disorder described herein is desired, such as a human.

The term “pharmaceutically acceptable salt(s)” as used herein refers to salts of acidic or basic groups that may be present in compounds used in the compositions. Compounds included in the present compositions that are basic in nature are capable of forming a wide variety of salts with various inorganic and organic acids. The acids that may be used to prepare pharmaceutically acceptable acid addition salts of such basic compounds are those that form non-toxic acid addition salts, i.e., salts containing pharmacologically acceptable anions, including, but not limited to, malate, oxalate, chloride, bromide, iodide, nitrate, sulfate, bisulfate, phosphate, acid phosphate, isonicotinate, acetate, lactate, salicylate, citrate, tartrate, oleate, tannate, pantothenate, bitartrate, ascorbate, succinate, maleate, gentisinate, fumarate, gluconate, glucaronate, saccharate, formate, benzoate, glutamate, methanesulfonate, ethanesulfonate, benzenesulfonate, p-toluenesulfonate and pamoate (i.e., 1,1′-methylene-bis-(2-hydroxy-3-naphthoate)) salts.

As used herein, “treating” includes any effect, e.g., lessening, reducing, modulating, or eliminating, that results in the improvement of the condition, disease, disorder and the like.

Therapeutically effective amount” includes the amount of the subject compound that will elicit the biological or medical response of a tissue, system, animal or human that is being sought by the researcher, veterinarian, medical doctor or other clinician. A compound described herein, e.g., ripretinib is administered in therapeutically effective amounts to treat a condition described herein, e.g., gastrointestinal stromal tumors. Alternatively, a therapeutically effective amount of a compound is the quantity required to achieve a desired therapeutic and/or prophylactic effect, such as an amount which results in the prevention of or a decrease in the symptoms associated with the condition.

As used herein, “AUC_(0-24h)” refers to the area under the plasma concentration-time curve from time zero to 24 hours for a compound described herein. As used herein, “AUC_(0-inf)” refers to the area under the plasma concentration-time curve from time zero to infinite time for a compound described herein. As used herein, “C_(max)” refers to the maximum plasma concentration of a compound described herein.

A compound described herein, e.g., ripretinib, can be formulated as a pharmaceutical composition using a pharmaceutically acceptable carrier and administered by a variety of routes. In some embodiments, such compositions are for oral administration. In some embodiments, compositions formulated for oral administration are provided as tablets. In some embodiments, such compositions are for parenteral (by injection) administration (e.g., a composition formulated for local injection at the site of a tumor, e.g., a diffuse-type giant cell tumor). In some embodiments, such compositions are for transdermal administration. In some embodiments, such compositions are for topical administration. In some embodiments, such compositions are for intravenous (IV) administration. In some embodiments, such compositions are for intramuscular (IM) administration. Such pharmaceutical compositions and processes for preparing them are well known in the art. See, e.g., REMINGTON: THE SCIENCE AND PRACTICE OF PHARMACY (A. Gennaro, et al., eds., 19^(th) ed., Mack Publishing Co., 1995).

Methods of Treatment

Described herein are methods of treating gastrointestinal stromal tumors in a patient in need thereof. For example, the present disclosure relates to a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg or more of ripretinib daily, e.g., 100 mg to 5000 mg, e.g., 100 mg to 500 mg, 100 mg to 250 mg, e.g., 150 mg, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib. In some embodiments, the method comprises administering to the patient 110 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 120 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 130 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 140 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 550 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 600 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 650 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 700 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 750 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 800 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 850 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 900 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 950 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 1000 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 550 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 600 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 650 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 700 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 750 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 800 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 850 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 900 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 950 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 1000 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib twice daily.

In some embodiments, a patient was only previously treated with a first line administration of imatinib, e.g., only imatinib and no other therapeutic compounds had been administered to the patient before administration of ripretinib to the patient. For example, a patient was not previously administered with sunitinib and/or regorafenib, e.g., the patient was not previously given a second line administration of sunitinib therapy and/or a third-line administration of regorafenib therapy.

In some embodiments, the patient has a non-nodal tumor lesion of greater than or equal to 1.0 cm in the long axis or greater than or equal to double the slide thickness in the long axis, within 21 days prior to the first dose of ripretinib. Contemplated methods of treatment include administering ripretinib on a 42-day cycle, comprising daily administrations of ripretinib without administering sunitinib. After at least one 42-day cycle comprising daily administrations of ripretinib, the patient may have progression-free survival as measured using mRECIST v1.1. In some embodiments, the patient treated with daily administrations of ripretinib may have significant progression free survival (e.g., about 3 months progression free survival or more, e.g., about 6 months progression free survival, as compared to a second line daily administration of 50 mg sunitinib for four weeks followed by two weeks without daily administrations on a 42-day cycle, wherein the patient's tumor has progressed from, or the patient was intolerant to, the previous first line administration of imatinib.

Contemplated treatments with ripretinib may treat a broad spectrum of KIT and PDGFRA mutations. For example, a patient's tumor may have a KIT exon 9 mutation, a PDGFRA exon 18 mutation, a PDGFRA exon 12 mutation or a PDGFRA exon 18 activation loop mutation. For example, the patient's tumor mutation is a PDGFRA D842V mutation.

In some embodiments, a patient's tumor has an imatinib resistant mutation selected from the group consisting of a KIT exon 17 activation loop mutation, a KIT exon 18 activation loop mutation, a KIT exon 13 mutation, a KIT exon 14 mutation, a KIT exon 18 mutation, a PDGFRA exon 12 mutation, a PDGFRA exon 14 mutation, a PDGRFA exon 15 mutation, and a PDGFRA exon 18 activation loop mutation. For example, the imatinib resistant mutation is a PDGFRA D842V mutation.

In some embodiments, the patient's tumor has an imatinib resistant mutation selected from the group consisting of KIT exon 13 or 14 mutation, PDGFRA exon 14 or 15 mutation, a KIT 17 or 18 activation loop mutation, and a PDGFRA 18 activation loop mutation. For example, the patient's tumor has an imatinib resistant KIT exon 17 mutation.

Also described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg or more, e.g., up to about 600 mg, e.g. up to about 250 mg, e.g., 100 mg or 150 mg, of ripretinib daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib or wherein the patient has a documented intolerance to one or more of imatinib, sunitinib and/or regorafenib. Contemplated methods of treatment include orally administering 100 mg, 150 mg or more of ripretinib daily without administering sunitinib on a 42-day cycle. In some embodiments, the method comprises administering to the patient 110 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 120 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 130 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 140 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 550 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 600 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 650 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 700 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 750 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 800 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 850 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 900 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 950 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 1000 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 550 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 600 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 650 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 700 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 750 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 800 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 850 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 900 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 950 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 1000 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib twice daily.

In some embodiments, a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100 mg or more of ripretinib daily, e.g., up to about 600 mg, e.g., 100 mg to 250 mg, e.g., 100 mg to 500 mg, e.g., 100 mg to 250 mg, e.g., 150 mg, wherein the patient was previously administered at least two tyrosine kinase inhibitors, is contemplated. Contemplated methods of treatment include orally administering 100 mg, 150 mg or more of ripretinib daily without administering sunitinib on a 42-day cycle. In some embodiments, the method comprises administering to the patient 110 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 120 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 130 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 140 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 550 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 600 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 650 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 700 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 750 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 800 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 850 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 900 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 950 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 1000 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 100 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 550 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 600 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 650 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 700 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 750 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 800 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 850 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 900 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 950 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 1000 mg of ripretinib once daily. In some embodiments, the method comprises administering to the patient 150 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 200 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 250 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 300 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 350 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 400 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 450 mg of ripretinib twice daily. In some embodiments, the method comprises administering to the patient 500 mg of ripretinib twice daily. In some embodiments, the patient has previously been administered two separate tyrosine kinase inhibitors, each selected from the group consisting of imatinib, sunitinib, regorafenib, lapatinib, gefitinib, erlotinib, vatalanib, crenolanib, and pharmaceutically acceptable salts thereof. In some embodiments, each of the tyrosine kinase inhibitors is independently selected from the group consisting of imatinib, sunitinib, and regorafenib. In some embodiments, each of the tyrosine kinase inhibitors is independently selected from the group consisting of imatinib mesylate, sunitinib malate, and regorafenib.

In some embodiments of the methods described herein, the patient is orally administered one or more tablets comprising ripretinib. For example, the disclosed methods include a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient one or more tablets comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib. In some embodiments, the patient is administered one tablet comprising ripretinib. In some embodiments, the patient is administered one tablet comprising 50 mg of ripretinib. In some embodiments, the patient is administered one tablet comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered two tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered two tablets each comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered three tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered three tablets each comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered four tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered four tablets each comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered five tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered five tablets each comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered six tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered six tablets each comprising 50 mg of ripretinib once daily.

Additionally, the disclosed methods include a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient, on a daily basis, one or more tablets each comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib or wherein the patient has a documented intolerance to one or more of imatinib, sunitinib and/or regorafenib. In some embodiments, the patient is administered one tablet comprising ripretinib. In some embodiments, the patient is administered one tablet comprising 50 mg of ripretinib. In some embodiments, the patient is administered one tablet comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered two tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered, once daily, two tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered three tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered, once daily, three tablets each comprising 50 mg of ripretinib once daily.

In some embodiments, provided is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient, on a daily basis, one or more tablets each comprising ripretinib, e.g., tablets each comprising 50 mg to 100 mg of ripretinib, wherein the patient was previously administered at least two tyrosine kinase inhibitors before administration of the ripretinib. In some embodiments, the patient is administered one tablet comprising ripretinib. In some embodiments, the patient is administered one tablet comprising 50 mg of ripretinib. In some embodiments, the patient is administered one tablet comprising 50 mg of ripretinib once daily. In some embodiments, the patient is administered two tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered, once daily, two tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered three tablets each comprising 50 mg of ripretinib. In some embodiments, the patient is administered, once daily, three tablets each comprising 50 mg of ripretinib. In some embodiments, the patient has previously been administered two separate tyrosine kinase inhibitors, each selected from the group consisting of imatinib, sunitinib, regorafenib, lapatinib, gefitinib, erlotinib, vatalanib, crenolanib, and pharmaceutically acceptable salts thereof. In some embodiments, each of the tyrosine kinase inhibitors is independently selected from the group consisting of imatinib, sunitinib, and regorafenib. In some embodiments, each of the tyrosine kinase inhibitors is independently selected from the group consisting of imatinib mesylate, sunitinib malate, and regorafenib.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg of ripretinib once daily, wherein the patient was previously administered three or more kinase inhibitors before administration of the ripretinib. In some embodiments, after at least 4 weeks of the daily ripretinib administration, the patient has at least a 5-month progression-free survival as measured using mRECIST v1.1. In some embodiments, orally administering to the patient 150 mg of ripretinib once daily comprises administering to the patient three tablets each tablet comprising 50 mg of ripretinib. In some embodiments, one of the three or more kinase inhibitors is imatinib. In some embodiments, the patient was previously administered imatinib, sunitinib and regorafenib.

In some embodiments, if the patient suffers from a Grade 3 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises a) withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days.

In some embodiments, if the patient suffers from a Grade 2 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises: a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; b) if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib or c) if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg daily ripretinib, wherein the patient's tumor has progressed from, or the patient was intolerant to, a first line administration of imatinib, a second line administration of sunitinib, and a third line administration of regorafenib.

In some embodiments, if the patient suffers from a Grade 3 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises a) withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days.

In some embodiments, if the patient suffers from a Grade 2 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises: a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; b) if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib or c) if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days.

In another embodiment, described herein is a method of treating a patient suffering from an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 150 mg of ripretinib once or twice daily, wherein the patient's tumor has progressed from, or the patient was intolerant to, a previous first line administration of imatinib. In some embodiments, if the patient suffers from Grade 3 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises a) withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days. In some embodiments, if the patient suffers from Grade 3 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises a) withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days. In some embodiments, if the patient suffers from Grade 2 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises: a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; b) if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib or c) if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days. In some embodiments, if the patient suffers from a Grade 3 adverse disorder selected from arthralgia or myalgia upon administration of the ripretinib, the method further comprises: a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 adverse disorder, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days. In some embodiments, if the patient suffers from Grade 3 hypertension upon administration of the ripretinib, the method further comprises withholding administration of ripretinib until the patient's blood pressure is controlled, and if the patient has less than or equal to Grade 1 blood pressure is, administering to the patient 150 mg daily ripretinib, or if the patient has more than Grade 1 blood pressure, administering 100 mg daily (e.g., 100 mg once daily) ripretinib.

In another embodiment, described herein is a method for achieving at least 5 months of progression free survival as determined by mRECIST 1.1 in a patient having an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100, 150 200, or 300 mg of ripretinib daily or twice daily for at least 28 days. In some embodiments, the patient has been administered at least one previous kinase inhibitor. In some embodiments, the patient has been administered at least three previous kinase inhibitors. In some embodiments, the at least one previous kinase inhibitor is imatinib. In some embodiments, comprising orally administering to the patient 100, 150 or 200 mg of ripretinib daily or twice daily for at least 4 months.

In another embodiment, described herein is a method for achieving at least 5 months of progression free survival as determined by mRECIST 1.1 in a patient having an advanced gastrointestinal stromal tumor, comprising orally administering to the patient 100, 150, or 200 mg of ripretinib daily or twice daily for at least 28 days. In some embodiments, the patient has been administered at least one previous kinase inhibitor. In some embodiments, the patient has been administered at least three previous kinase inhibitors. In some embodiments, the at least one previous kinase inhibitor is imatinib. In some embodiments, comprising orally administering to the patient 100, 150, or 200 mg of ripretinib daily or twice daily for at least 4 months.

In another embodiment, descried herein is a method of treating a patient suffering from Grade 3 palmer-plantar erythrodysesthesia syndrome while being administered 150 mg ripretinib daily or twice daily, comprising withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily (e.g., 100 mg once daily) ripretinib for at least 28 days.

In another embodiment, descried herein is a method of treating a patient suffering from Grade 2 palmer-plantar erythrodysesthesia syndrome upon administration of 150 mg ripretinib daily or twice daily, comprising a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; b) if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib or c) if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days.

In another embodiment, described herein is a method of treating a gastrointestinal stromal tumor in a patient in need thereof, wherein the patient is being treated concurrently with a CYP3A4 inhibitor, the method comprising: orally administering to the patient 100 mg or 150 mg of ripretinib, or a pharmaceutically acceptable salt thereof, once or twice daily, and wherein upon administration of the ripretinib and the CYP3A4 inhibitor, provides an increased ripretinib area under the plasma concentration curve (AUC_(0-inf)) of 80% or more in the patient as compared to administration of ripretinib without concurrent treatment of the CYP3A4 inhibitor, and therefore the patient is at higher risk of an adverse event; and monitoring the patient more frequently, as compared to a patient not being treated with a CYP3A4 inhibitor, for the adverse event. In some embodiments, if the patient suffers from a Grade 3 palmer-plantar erythrodysesthesia syndrome adverse event, the method further comprises a) withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome, then administering to the patient 100 mg daily ripretinib for at least 28 days. In some embodiments, if the patient suffers from Grade 2 palmer-plantar erythrodysesthesia syndrome upon administration of the ripretinib, the method further comprises: a) withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; b) if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib or c) if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days. In some embodiments, the CYP3A4 inhibitor is selected from the group consisting of itraconazole, ketoconazole, clarithromycin, and indinavir. In some embodiments, the CYP3A4 inhibitor is itraconazole. In some embodiments, the patient has previously been administered one or more tyrosine kinase inhibitors, each selected from the group consisting of imatinib, sunitinib, regorafenib, lapatinib, gefitinib, erlotinib, vatalanib, crenolanib, and pharmaceutically acceptable salts thereof.

In another embodiment, described herein is a method of treating a gastrointestinal stromal tumor in a patient in need thereof, wherein the patient is being treated concurrently with a proton pump inhibitor, the method comprising: orally administering to the patient 100 mg or 150 mg of ripretinib, or a pharmaceutically acceptable salt thereof, once or twice daily, and wherein administration of the ripretinib and proton pump inhibitor to the patient provides no clinically significant difference in the plasma exposure of ripretinib in the patient as compared to administration of ripretinib without concurrent treatment of the proton pump inhibitor. In some embodiments, the proton pump inhibitor is selected from the group consisting of pantoprazole, omeprazole, lansoprazole, rabeprazole, esomeprazole, and dexlansoprazole. In some embodiments, the proton pump inhibitor is pantoprazole. In some embodiments, the patient is being treated concurrently with 40 mg of the proton pump inhibitor once daily.

In another embodiment, described herein is a method of treating a gastrointestinal stromal tumor in a patient in need thereof, the method comprising orally administering to the patient 100 mg or 150 mg of ripretinib, or a pharmaceutically acceptable salt thereof, once or twice daily, wherein the ripretinib is administered to the patient with food or without food. In some embodiments, the food comprises a high-fat meal (e.g., a high-fat meal described herein).

In some embodiments, the therapeutic efficacy of ripretinib is determined by the progression-free survival of the patient after independent radiologic review using Response Evaluation Criteria in Solid Tumors (RECIST). In some embodiments, the therapeutic efficacy of ripretinib is determined by the progression-free survival of the patient after independent radiologic review using modified Response Evaluation Criteria in Solid Tumors (mRECIST). In some embodiments, the therapeutic efficacy of ripretinib is determined by the Objective Response Rate (ORR), Time to Tumor Progression (TTP) or Overall Survival (OS) of the patient after independent radiologic review using mRECIST. In some embodiments, the therapeutic efficacy of ripretinib is determined by the progression-free survival of the patient based on investigator assessment. In some embodiments, the therapeutic efficacy of ripretinib is determined by the quality of life of the patient in accordance with European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire for Cancer 30-item (EORTC-QLQ-C30) and the EuroQol 5-Dimension 5-Level (EQ-5D-5L) questionnaires. In some embodiments, the therapeutic efficacy of ripretinib is determined by the disease control rate of the patient. In some embodiments, the therapeutic efficacy of ripretinib is determined by the duration of response of the patient.

After at least one month, two months, e.g., 42 days or more of treatment with ripretinib, the patient may have a progression-free survival as measured using mRECIST v1.1. As another example, the patient may have a least a 5 or 6 month progression-free survival as compared to placebo after at least 4 weeks of daily administration of ripretinib, and/or for example, after 4 weeks of daily administration of ripretinib, significantly reduced the risk of disease progression or death by 85%.

In some embodiments, the patient has at least one measurable tumor lesion according to modified RECIST Version 1.1 within 21 days prior to the first dose of ripretinib. In some embodiments, the patient has a non-nodal tumor lesion of greater than or equal to 1.0 cm in the long axis or greater than or equal to double the slide thickness in the long axis, within 21 days prior to the first dose of ripretinib.

In some embodiments, the patient's tumor has a KIT exon 9 mutation, a PDGFRA exon 18 mutation, a PDGFRA exon 12 mutation or a PDGFRA exon 18 activation loop mutation. For example, the patient's tumor mutation is a PDGFRA D842V mutation.

In some embodiments, the patient's tumor has an imatinib resistant, sunitinib resistant, and/or regorafenib resistant mutation selected from the group consisting of a KIT exon 17 activation loop mutation, a KIT exon 18 activation loop mutation, a KIT exon 13 mutation, a KIT exon 14 mutation, a KIT exon 18 mutation, a PDGFRA exon 12 mutation, a PDGFRA exon 14 mutation, a PDGRFA exon 15 mutation, and a PDGFRA exon 18 activation loop mutation. For example, the resistant mutation is a PDGFRA D842V mutation.

In some embodiments, the patient's tumor has a drug resistant mutation selected from the group consisting of KIT exon 13 or 14 mutation, PDGFRA exon 14 or 15 mutation, a KIT 17 or 18 activation loop mutation, and a PDGFRA 18 activation loop mutation. For example, the tumor has a drug resistant KIT exon 17 mutation.

Dose Modifications

Dose modifications may be made in the methods of administering ripretinib described herein as a result of adverse events experienced by the patient. In some embodiments, the dose modification is a dose interruption. In some embodiments, the dose modification is a permanent discontinuation in dosing. In some embodiments, the dose modification is a dose reduction. In some embodiments, the dose of ripretinib administered to the patient is reduced from 150 mg once daily, e.g., three tablets each comprising 50 mg of ripretinib, to 100 mg once daily, e.g., two tablets each comprising 50 mg of ripretinib. In some embodiments, the dose of ripretinib administered to the patient is reduced from 150 mg once daily, e.g., three tablets each comprising 50 mg of ripretinib, to 50 mg once daily, e.g., one tablet comprising 50 mg of ripretinib. In some embodiments, the adverse reaction is selected from the group consisting of a hand-foot skin reaction (e.g., palmar-plantar erythrodysesthesia syndrome), hypertension, arthralgia, and myalgia.

In some embodiments, the adverse event is graded in accordance with the National Cancer Institute Common Terminology Criteria for Adverse Events, version 4.03 (e.g., baseline, Grade 1, Grade 2, Grade 3, or Grade 4). In some embodiments, the dose modification is a dose interruption (e.g., a dose interruption of at least 7 days) as a result of a Grade 2 adverse event. In some embodiments, dosing resumes at the same dose level before the dose interruption if the adverse event is lowered to Grade 1 or baseline within a first time period (e.g., within 7 days). In some embodiments, dosing resumes at a reduced dose level before the dose interruption if the adverse event is lowered to Grade 1 or baseline after a first time period (e.g., after 7 days). In some embodiments, the reduced dose level is re-escalated to the dose level prior to the dose interruption if the adverse event is lowered to Grade 1 or baseline after a first time period but is maintained as a Grade 1 or baseline adverse event after a second time period (e.g., after 28 days). In some embodiments, the dose modification is a dose interruption (e.g., a dose interruption of at least 7 days up to a maximum of 28 days) as a result of a Grade 3 adverse event. In some embodiments, dosing is continued at a reduced level after the dose interruption. In some embodiments, the dose modification is a permanent discontinuation in dosing as a result of a Grade 4 adverse event (e.g., Grade 4 hypertension).

A patient can be administered an additional treatment in response to an adverse event or to prevent an adverse event from occurring. In some embodiments, a patient suffering from an adverse dermatologic reaction, e.g., a hand-foot skin reaction, e.g., palmar-plantar erythrodysesthesia syndrome, is administered a topical composition (e.g., an emollient) to treat the adverse dermatologic reaction. In some embodiments, the patient is administered the topical composition (e.g., an emollient) based on the severity of the adverse dermatologic reaction, e.g., a Grade 2, Grade 3 adverse dermatologic reaction, e.g., a Grade 1, Grade 2, or Grade 3 hand-foot skin reaction, e.g., a Grade 1, Grade 2 or Grade 3 palmar-plantar erythrodysesthesia syndrome. In some embodiments, the topical composition (e.g., an emollient) is administered to the patient during a dose interruption of ripretinib. In some embodiments, the topical composition (e.g., an emollient) is administered to the patient contemporaneously with a dose of ripretinib, e.g., a reduced dose of ripretinib.

A patient can also be administered an additional treatment prior to, or during administration of ripretinib in accordance with the methods described herein to prevent or ameliorate an adverse event. In some embodiments, the patient is administered a topical composition (e.g., an emollient) before and/or during ripretinib administration to prevent or ameliorate the onset of an adverse dermatologic reaction, e.g., a hand-foot skin reaction, e.g., palmar-plantar erythrodysesthesia syndrome.

EXAMPLES Example 1 An Open-Label, Randomized Study to Compare the Efficacy of Ripretinib Versus Sunitinib in Patients with Advanced GIST with Prior Imatinib Therapy

Study Design. Approximately 358 eligible patients will be randomized into two cohorts in a 1:1 ratio in which one cohort undergoes continuous 42-day cycles of receiving ripretinib dosed at 150 mg daily (179 patients) and the other cohort receives sunitinib dosed at 50 mg daily for 4 weeks and then 2 weeks off on 42-day cycles (179 patients).

Given the mutation-driven natural history of GIST and the well-described relationship between secondary mutations and emergence of resistance to first- and second-line TKIs, the results of this study will evaluate ripretinib compared with sunitinib as second-line therapy in patients with GIST following imatinib therapy.

The primary end point of the study is to assess the progression-free survival (PFS) of ripretinib by blinded independent central review (BICR) using modified Response Evaluation Criteria in Solid Tumors version 1.1 (mRECIST v1.1). The key secondary efficacy end points include the assessment of ORR by BICR using mRECIST v1.1 and OS.

Statistical Analysis. PFS is defined as the time from randomization to the date of the first documented progression of disease or death due to any cause and is based on BICR assessment of the primary end point. OS is defined as the time from randomization to the date of death due to any cause. OS and PFS with 95% CI will be summarized using Kaplan-Meier methodology; point estimates of hazard ratios will be obtained from a Cox regression model. Objective response is defined as a CR or PR by BICR assessment using mRECIST v1.1.

Example 2 A Randomized, Double-Blind, Placebo-Controlled, International, Multicenter Study to Evaluate the Safety, Tolerability, and Efficacy of Ripretinib Compared to Placebo in Patients with Advanced GIST Whose Previous Therapies Have Included Imatinib, Sunitinib, and Regorafenib

This study was a randomized (2:1), double-blind, placebo-controlled, international, multicenter study to evaluate the safety, tolerability, and efficacy of ripretinib compared to placebo in 129 patients with advanced GIST whose previous therapies have included at least imatinib, sunitinib, and regorafenib. Patients were randomized 2:1 to either 150 mg of ripretinib or placebo once daily. The primary efficacy endpoint is progression-free survival (PFS) as determined by independent radiologic review using modified Response Evaluation Criteria in Solid Tumors (RECIST). Secondary endpoints as determined by independent radiologic review using modified RECIST include Objective Response Rate (ORR), Time to Tumor Progression (TTP) and Overall Survival (OS).

Results. This study achieved its primary endpoint of improved PFS as determined by blinded independent central radiologic review using modified Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.

Ripretinib demonstrated a median PFS of 6.3 months (27.6 weeks) compared to 1.0 month (4.1 weeks) in the placebo arm and significantly reduced the risk of disease progression or death by 85% (HR of 0.15, p<0.0001) compared to placebo. PFS rates at 6 months were 51% (95% CI: 39.4, 61.4) for ripretinib and 3.2% (95% CI: 0.2, 13.8) for placebo. Plots of survival probability with respect to PFS for patients on ripretinib and patients on placebo are shown in FIG. 1.

For the key secondary endpoint of objective response rate (ORR), as determined by blinded independent central radiologic review using modified RECIST version 1.1, ripretinib demonstrated an ORR of 9.4% compared with 0% for placebo (p-value=0.0504), which was not statistically significant. Ripretinib in this study also showed a clinically meaningful improvement over placebo in terms of the secondary endpoint overall survival (OS) (median OS 15.1 months vs. 6.6 months, HR=0.36, nominal p-value=0.0004; OS rates at 12 months were 65.4% (95% CI: 51.6, 76.1) for ripretinib and 25.9% (95% CI: 7.2, 49.9) for placebo); however, because statistical significance was not achieved for ORR, the hypothesis testing of OS was not formally performed. Plots of survival probability with respect to OS of patients on ripretinib and patients on placebo are shown in FIG. 2. According to the pre-specified hierarchical testing procedure of the endpoints, the hypothesis testing of OS cannot be formally conducted unless the test of ORR is statistically significant. The OS data for the placebo arm includes patients taking placebo who, following progression, were crossed-over to ripretinib treatment. Plots illustrating survival probability with respect to OS in patients on ripretinib, crossed over from placebo to ripretinib, and patients without cross-over are shown in FIG. 3. Plots and additional data illustrating survival probability with respect to PFS in patients on ripretinib, crossed over from placebo to ripretinib, and patients without cross-over are shown in FIG. 13. Additionally, more patients receiving ripretinib had stable disease (SD) for 12 weeks (40 [47.1%] vs 2 [4.5%], respectively) and less PD (16 [18.8%] vs 28 [63.6%], respectively) than patients on placebo. The large percentage of patients receiving ripretinib with stable disease (SD) is notable as the absence of progression is considered an important marker of therapeutic benefit in GIST. Unlike many other advanced solid tumors, the absence of progression (whether a partial response (PR) or SD) is predictive of PFS and OS benefit in patients with advanced GIST.

Patients that successfully crossed over from placebo had smaller tumors vs those that did not crossover (median sum of longest diameter of target lesions 119.4 mm vs 183.3 mm). In addition, the median age of those who crossed over was higher than those who did not cross over (68.0 vs 58.0 years) and none had a baseline Eastern Cooperative Oncology Group (ECOG) score of 2, while 3 patients in the group that did not cross over had an ECOG score of 2. Patients that crossed over had a median PFS of 20.0 weeks [95% CI, 8.0-NE] vs 27.6 weeks seen in the initial ripretinib arm and 4.1 weeks seen in the initial placebo arm, respectively. Median OS in patients who crossed over was 11.6 months, vs. 15.1 months in patients initially randomized to ripretinib and 1.8 months in patients on placebo who did not crossover. TEAEs during the crossover period suggest no safety concerns when compared to the safety profile of patients initially assigned to ripretinib.

Ripretinib was generally well tolerated and the adverse event results were consistent with data from previously presented Phase 1 study results. Grade 3 or 4 treatment-emergent adverse events (TEAEs) occurred in 42 (49%) patients on the ripretinib arm compared to 19 (44%) on the placebo arm. Grade 3 or 4 TEAEs >5% of patients in the ripretinib arm were anemia (9%; n=8), abdominal pain (7%; n=6) and hypertension (7%; n=6). Grade 3 or 4 TEAEs >5% of patients in the placebo arm were anemia (14%; n=6). Table 1 lists TEAEs >15% in the ripretinib arm compared to placebo.

TABLE 1 Treatment-emergent adverse events for patients administered with either ripretinib or placebo. Ripretinib 150 mg Treatment Emergent Placebo Daily Adverse Event (N = 43)⁽¹⁾ (N = 85)⁽¹⁾ Any event 42 (98%) 84 (99%) Alopecia  2 (5%) 44 (52%) Fatigue 10 (23%) 36 (42%) Nausea  5 (12%) 33 (39%) Abdominal pain 13 (30%) 31 (36%) Constipation  8 (19%) 29 (34%) Myalgia  5 (12%) 27 (32%) Diarrhea  6 (14%) 24 (28%) Decreased appetite  9 (21%) 23 (27%) Palmar-plantar  0 18 (21%) erythrodysesthesia syndrome Vomiting  3 (7%) 18 (21%) Headache  2 (5%) 16 (19%) Weight decreased  5 (12%) 16 (19%) Arthralgia  2 (5%) 15 (18%) Blood bilirubin increased  0 14 (16%) Oedema peripheral  3 (7%) 14 (16%) Muscle spasms  2 (5%) 13 (15%)

In table 1, (1) indicates that the safety population includes 128 patients. One patient was randomized to placebo but did not receive study drug.

Patient Reported Outcomes

Patient reported outcomes were assessed by EQ-5D-5L, which provides a visual analogue scale (VAS), and EORTC QLQ-C30, which provides physical function and role function scales. The EQ-5D-5L VAS (or EQ-VAS) records the respondent's overall current health on a vertical visual analogue scale and provides a quantitative measure of the patient's perception of overall health. These patient outcomes were reported across 28-day cycles of receiving 150 mg QD ripretinib or placebo.

FIG. 5A, FIG. 5B, and FIG. 5C depict patient report outcome by EQ-VAS showing the visual scale used to assess scores (FIG. 5A), score changes from baseline (FIG. 5B) and corresponding patient percentage distributions (FIG. 5C). The EQ-VAS score improved on average 3.7 from baseline to Cycle 2, Day 1 (C2D1) among patients taking ripretinib in contrast to placebo patients who saw on average, a decline from baseline to C2D1 of 8.9 (p=0.004). 70 patients were receiving ripretinib and 32 were receiving placebo.

The EORTC QLQ-C30 is an assessment of function and symptoms of therapy by cancer patient, and is not specific to any cancer. The EORTC QLQ-C30 is a 30-question plus one global health status, including 5 functional scales, 3 symptom scales and a global health status.

FIG. 6A, FIG. 6B, and FIG. 6C depict EORTC QLQ-C30 physical function questions (FIG. 6A), patient score changes from baseline in response (FIG. 6B) and corresponding patient percentage distributions (FIG. 6C). Physical function scores improved on average 1.6 from baseline to C2D1 among patients taking ripretinib in contrast to placebo patients who saw on average, a decline from baseline to C2D1 of 8.9 (p=0.004). 71 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 7A, FIG. 7B, and FIG. 7C depict EORTC QLQ-C30 role function questions (FIG. 7A) and patient score changes from baseline in response (FIG. 7B) and corresponding patient percentage distributions (FIG. 7C). Role function score improved on average 3.5 from baseline to C2D1 among patients taking ripretinib in contrast to placebo patients who saw on average, a decline from baseline to C2D1 of 17.1 (p=0.001). 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 8A and FIG. 8B depict patient score changes from baseline (FIG. 8A) and corresponding patient percentage distributions (FIG. 8B) in response to Question C29 of EORTC QLQ-C30 (“How would you rate your overall health during the past week?”) from a scale of 1 (“Very poor”) to 7 (“Excellent”). There was a 0.20 improvement in C29 score in the ripretinib group compared to a 0.78 decrease in the placebo group (p=0.001). 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 9A and FIG. 9B depict patient score changes from baseline (FIG. 9A) and corresponding patient percentage distributions (FIG. 9B) in response to Question C30 of EORTC QLQ-C30 (“How would you rate your overall quality of life during the past week?”) from a scale of 1 (“Very poor”) to 7 (“Excellent”). There was a 0.28 improvement in score in the ripretinib group compared to a 0.76 decrease in the placebo group (p=0.001). 70 patients were receiving ripretinib and 32 were receiving placebo.

FIG. 10 depicts mean changes in baseline scores in EQ-VAS across various time points, from Cycle 1, Day 15 up to Cycle 15, Day 1 of the intention-to-treat population. FIG. 11A and FIG. 11B depict mean changes in baseline scores in EORTC QLQ-C30 role function and EORTC QLQ-C30 physical function, respectively, across various time points, from Cycle 1, Day 15 up to Cycle 15, Day 1 of the intention-to-treat population. FIG. 12A and FIG. 12B depict mean changes in baseline scores in EORTC QLQ-C30 question C29 response and EORTC QLQ-C30 question C30 response, respectively, across various time points, from Cycle 1, Day 15 up to Cycle 15, Day 1 of the intention-to-treat population.

Open-Label Phase and Dose Escalation

Patients whose disease progressed during the double blind phase of the study were escalated to 150 mg BID ripretinib, continued at the 150 mg QD dose, or discontinued in an open label-phase of the study. Table 8 shows a comparison of patients that received 150 mg QD ripretinib at the data cutoff time point of the double blind phase and the data cutoff time point of the open-label phase. The data in Table 8 suggest that data cut 9 months after the primary double-blind analysis has shown improvement in mOS and a similar mPFS in the ripretinib arm.

In the study, at least 31 patients dose escalated to 150 mg BID ripretinib in an open-label phase upon disease progression. PFS studies in the double-blind and open-label periods for these patients are depicted in FIG. 14A and FIG. 14B, respectively, with FIG. 14C depicting median PFS data.

Wild Type (KIT and PDGFRA) Mutations

PFS data among patients with wild-type KIT or PDGFRA mutations were further evaluated at 150 mg ripretinib QD. PFS data of patients with these wild-type KIT and PDGFRA mutations are shown in FIG. 15.

Additional Mutational Analyses

Progression free survival PFS and overall survival (OS) data based on patients with a primary Exon 11 mutation or patients with a non-Exon 11 mutation are shown in FIGS. 16A (PFS) and 16B (OS) at 150 mg ripretinib QD. The data show that, regardless of primary mutation, whether a primary Exon 11 or a non-Exon 11 primary mutation, GIST patients derive similar benefit from ripretinib over placebo.

Progression free survival PFS and overall survival (OS) data based on patients with a primary Exon 11 mutation or those with a primary Exon 9 mutation are shown in FIGS. 17A (PFS) and 17B (OS) at 150 mg ripretinib QD. The data show that, Regardless of primary mutation, both Exon 11 and Exon 9 GIST patients derive a benefit from ripretinib over placebo.

Furthermore, progression free survival PFS and overall survival (OS) data based on patients with a primary Exon 11 mutation, or a primary Exon 9 mutation, or other mutations, and wild type (KIT and PDGFRA) are shown in FIGS. 18A (PFS) and 19B (OS) at 150 mg ripretinib QD.

PFS studies for patients with certain primary mutations (Exon 9 or Exon 11) who dose escalated to 150 mg BID ripretinib are shown in FIGS. 19A and 19B for the double-blind and open-label periods, respectively.

Additionally, FIG. 20 shows exemplary progression free survival data for patients with other KIT mutations and PGDFR mutations in the study of Example 2 at 150 mg ripretinib QD.

FIGS. 26A-D depicts an exemplary comparison of PFS of patient subgroups with Exon 9 (FIG. 26A), Exon 11 (FIG. 26B), Exon 13 (FIG. 26C), or Exon 17 (FIG. 26D) KIT mutations. This exemplary data show that ripretinib showed PFS benefit in all assessed patient subgroups compared to placebo.

Example 3 Results for a Clinical Study of Ripretinib in Patients with Second-Line Through Fourth-Line Plus GIST

Results. Data from 178 GIST patients receiving ripretinib at doses of >100 mg daily are noted in Table 2. The table includes investigator-assessed objective response rate (ORR) by best response, disease control rate (DCR) and median progression free survival (mPFS), all of which were determined by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.

TABLE 2 Results/clinical study of ripretinib Objective Response Rate by Best Response Median Includes Disease Progres- Uncon- Control sion firmed Rate Free Censored Mean Line of (Confirmed at 3 Survival Patients Treatment Therapy⁽¹⁾ Only) Months (mPFS) for mPFS Duration⁽²⁾⁽³⁾ Second-Line 30% (22%) 81% 42 weeks 38% 43 weeks (n = 37) Third-Line 23% (13%) 80% 40 weeks 32% 48 weeks (n = 31) Fourth-Line 15% (8%) 73% 30 weeks 30% 49 weeks (n = 60) ≥Fourth-Line 11% (7%) 66% 24 weeks 22% 41 weeks (n = 110)⁽⁴⁾

In Table 2, (1) indicates overall number of patients (n=178) remains the same as prior data presented at ESMO 2018; based on additional data cleaning, one patient from each of 2^(nd) line and 4^(th)/≥4^(th) line were reclassified as 3^(rd) line patients; (2) refers to median treatment durations were: 2^(nd) line=44 weeks, 3^(rd) line=48 weeks, 4^(th) line=46 weeks and ≥4^(th) line=29 weeks; (3) refers to including 60 patients who elected for intra-patient dose escalation from 150 mg QD to 150 mg BID; and (4) refers to the number of patients including 60 patients from 4^(th) line.

Ripretinib was generally well tolerated and the updated adverse events were consistent with previously presented Phase 1 data in patients with GIST. Grade 3 or 4 treatment-emergent adverse events (TEAEs) in >5% of patients were lipase increased (18%; n=33), anemia (11%; n=20), hypertension (7%; n=13) and abdominal pain (6%; n=11). 13% of patients (n=24) experienced TEAEs leading to study treatment discontinuation, 17% of patients (n=31) experienced TEAEs leading to dose reduction and 49% of patients (n=88) had TEAEs leading to study drug interruption. Table 3 lists TEAEs>10% for GIST patients treated with ≥100 mg of ripretinib daily.

TABLE 3 Treatment-emergent adverse events for patients administered with 100 mg of ripretinib daily. GIST PATIENTS @ ≥100 MG DAILY Treatment Emergent Adverse Events (TEAEs) >10% Alopecia 102 (57%)  0 (0%) 102 (57%) Fatigue  94 (53%)  4 (2%)  98 (55%) Myalgia  79 (44%)  0 (0%)  79 (44%) Nausea  77 (43%)  1 (1%)  78 (44%) Palmar-plantar erythrodysaesthesia  71 (40%)  1 (1%)  72 (40%) syndrome Constipation  67 (37%)  0 (0%)  67 (37%) Decreased appetite  60 (34%)  2 (1%)  62 (35%) Diarrhea  50 (28%)  3 (2%)  53 (30%) Weight decreased  51 (29%)  1 (1%)  52 (29%) Lipase increased  18 (10%) 33 (18%)  51 (29%) Muscle spasms  47 (26%)  0 (0%)  47 (26%) Abdominal pain  33 (18%) 11 (6%)  44 (25%) Vomiting  42 (24%)  2 (1%)  44 (25%) Arthralgia  40 (22%)  0 (0%)  40 (22%) Anemia  18 (10%) 20 (11%)  38 (21%) Hypertension  25 (14%) 13 (7%)  38 (21%) Cough  37 (21%)  0 (0%)  37 (21%) Dry skin  37 (21%)  0 (0%)  37 (21%) Dyspnea  32 (18%)  4 (2%)  36 (20%) Headache  33 (18%)  1 (1%)  34 (19%) Back Pain  30 (17%)  2 (1%)  32 (18%) Dizziness  29 (16%)  0 (0%)  29 (16%) Rash  27 (15%)  0 (0%)  27 (15%) Hypokalaemia  21 (12%)  5 (3%)  26 (15%) Hypophosphataemia  17 (10%)  8 (5%)  25 (14%) Actinic keratosis  25 (14%)  0 (0%)  25 (14%) Blood bilirubin increase  16 (9%)  5 (3%)  21 (12%) Amylase increased  19 (11%)  2 (1%)  21 (12%) Insomnia  21 (12%)  0 (0%)  21 (12%) Seborrhoeic keratosis⁽²⁾  21 (12%)  0 (0%)  21 (12%) Urinary tract infection  16 (9%)  4 (2%)  20 (11%) Dysgeusia  20 (11%)  0 (0%)  20 (11%) Pain in extremity  18 (10%)  1 (1%)  19 (11%) Blood creatine phosphokinase  13 (7%)  5 (3%)  18 (10%) increased Upper respiratory tract infection  18 (10%)  0 (0%)  18 (10%) Rash maculo-papular  18 (10%)  0 (0%)  18 (10%) Hypomagnesaemia  18 (10%)  0 (0%)  18 (10%) Pruritus  18 (10%)  0 (0%)  18 (10%) Skin papilloma⁽²⁾  17 (10%)  0 (0%)  17 (10%) Vision blurred  17 (10%)  0 (0%)  17 (10%)

In table 3, (1) refers to including one patient that only participated in the food effect portion of the Phase 1 study; and (2) indicates that dermatology skin exams were implemented to better evaluate skin lesions.

Example 4 Results for a Clinical Study of 150 mg QD Ripretinib Administered to Patients with Second-Line Through Fourth-Line Plus GIST

Efficacy and safety results from the escalation and expansion phases of a phase 1 study for patients with GIST treated at ripretinib 150 mg QD as the starting dose in 28-day cycles are presented. Local, investigator-assessed Response Evaluation Criteria in Solid Tumors (RECIST 1.1) response assessments were performed every 2 cycles, and patients in the expansion cohorts who progressed per RECIST 1.1 were allowed to dose escalate to 150 mg BID.

142 patients with GIST in the escalation and expansion phases were treated at 150 mg QD dose. Number of patients by line of therapy were as follows: 31 2^(nd) line, 28 3^(rd) line, and 83>4^(th) line patients. 135 patients (95.1%) had KIT-mutant GIST, and 7 patients (4.9%) had PDGFRA-mutant GIST.

Results on the efficacy by line of therapy in patients with GIST receiving ripretinib 150 mg QD are presented in Table 4. For example, the confirmed-only complete response (CR), partial response (PR), stable disease, and progressive disease are presented in Table 4. The objective response rate data in Table 4 relates to the proportion of patients with CR+PR. The median PFS data in Table 4 refers to progression-free survival per investigator assessment, by line of therapy. PFS plots by line of therapy are also shown in FIG. 4.

TABLE 4 Efficacy by line of therapy in patients with GIST receiving ripretinib 150 mg QD. 2^(nd) Line 3^(rd) Line ≥4^(th) Line Parameters (n = 31) (n = 28) (n = 83) Best response (confirmed only), n (%) CR 0 0 0 PR 6 (19.4) 4 (14.3) 6 (7.2) Stable disease 21 (67.7) 18 (64.3) 49 (59.0) Progressive disease 4 (12.9) 6 (21.4) 22 (26.5) Not evaluable 0 0 1 (1.2) No response assessment 0 0 5 (6.0) ORR, n (95% CI) 19.4 (7.5, 14.3 (4.0, 7.2 (2.7, 37.5) 32.7) 15.1) Duration of treatment^(a) Mean, weeks (SD) 56.1 (34.24) 57.5 (32.95) 44.9 (36.58) Median, weeks 64 51 29 Min, Max 4,132 8,124 0.1, 140 Duration of response n 6 4 6 Number of events 3 1 3 Median, weeks 80 NE 76.1 95% CI 24.7, 80.0 52.1, NE 24.1, NE PFS Number of censored 8 6 12 patients Median, weeks 46.4 36.3 23.9 95% CI 24.0, 60.0 23.9, 48.4 15.9, 24.3 In Table 4: ^(a)64 subjects escalated to 150 mg BID among patients with GIST in the 150 mg QD dose group. CI, confidence interval; CR, complete response; NE, not estimable; ORR, objective response rate; PFS, progression-free survival; PR, partial response; SD, standard deviation. Local (investigator) response assessment.

In subjects dose escalated to 150 mg BID, PFS before (PFS1) and after (PFS2) dose escalation was evaluated and is shown in FIGS. 25A and 25B, respectively. The data support that, regardless of line of therapy, patients received additional clinical benefit by investigator assessment after dose escalation to 150 mg BID.

Mutational Analysis

FIG. 27 shows PFS data of exemplary second and third-line patients with Exons 9, 11, 13, or 17 KIT mutations. The data show that, in second and third line populations, patients with such various KIT mutations have comparable PFS.

Example 5 Protocol for Dose Modification of Ripretinib as a Result of Adverse Reactions

If dose modifications of ripretinib are required due to adverse reactions, the following protocol will be applied: reduce the dose in 50 mg (one tablet) increments; the lowest recommended dose of ripretinib is 50 mg once daily. Ripretinib dosage reductions for adverse reactions are summarized in Table 5.

TABLE 5 Recommended Dose Reduction for Adverse Reactions Dose Level Dose Recommended starting dose 150 mg once daily First dose reduction Reduce to 100 mg once daily Second dose reduction Reduce to 50 mg once daily (lowest recommended dose)

Dosing will be reduced, interrupted, or discontinued for certain toxicities. See Table 6 for dose modification guidelines.

TABLE 6 Recommended Dose Modifications for ripretinib Adverse Reaction Severity^(a) Dosage Modifications Hand-foot Grade 2 Interrupt ripretinib for at least 7 days. skin If the event returns to Grade 1 or baseline reaction within 7 days, resume ripretinib at the (HFSR) same dose level. [palmar- If the event returns to Grade 1 or baseline plantar after 7 days, resume ripretinib at a erythrody- reduced dose level (see Table 5). sesthesia If after a dose reduction, the event is syndrome maintained at Grade 1 or baseline for at (PPES) least 28 days, consider re-escalating ripretinib by 1 dose level (see Table 5). If this is a recurrence, after event returns to Grade 1 or baseline, resume ripretinib at a reduced dose level (see Table 5) regardless of time to improvement. Grade 3 Interrupt ripretinib for at least 7 days or until the event returns to Grade 1 or baseline (maximum 28 days). Resume ripretinib at a reduced dose level (see Table 5). If after a dose reduction the event is maintained at Grade 1 or baseline for at least 28 days of dosing, consider re- escalating ripretinib by 1 dose level (see Table 5). Hyper- Grade 3 Medically manage hypertension to tension achieve normal blood pressure. If symptomatic hypertension, withhold ripretinib and treat hypertension. Resume ripretinib at the same dose level after symptoms have resolved. If blood pressure is not controlled with medical management, reduce ripretinib to the next dose level (see Table 5). If Grade 3 hypertension recurs despite ripretinib dose reduction and medical management, reduce ripretinib to the lowest recommended dose of 50 mg once daily. Grade 4 Discontinue ripretinib permanently. Life-threatening consequences (e.g., malignant hypertension, transient or permanent neurologic deficit, hypertensive crisis) Arthralgia/ Grade 2 Interrupt ripretinib for at least 7 days. Myalgia If the event returns to Grade 1 or baseline within 7 days, resume ripretinib at the same dose level. If the event returns to Grade 1 or baseline after 7 days, resume ripretinib at a reduced dose level (see Table 5) . If after a dose reduction, the event is maintained at Grade 1 or baseline for at least 28 days of dosing, consider re- escalating ripretinib by 1 dose level (see Table 5). If this is a recurrence, after event returns to Grade 1 or baseline, resume ripretinib at a reduced dose level (see Table 5) regardless of time to improvement. Grade 3 Interrupt ripretinib for at least 7 days or until the event returns to Grade 1 or baseline (maximum 28 days). Resume ripretinib at a reduced dose level (see Table 5). If after a dose reduction the event is maintained at Grade 1 or baseline for at least 28 days of dosing, consider re- escalating ripretinib by 1 dose level (see Table 5). Other Grade 3 or Interrupt ripretinib until toxicity resolves adverse higher toxicity to Grade 1 or baseline (maximum 28 reactions considered days). related to If the event returns to Grade 1 or treatment baseline, resume ripretinib at a reduced dose level (see Table 5). If the reduced dose is tolerated without recurrence of the event for at least 28 days, consider re-escalating ripretinib to the prior dose level (see Table 5). If Grade 3 or higher toxicity recurs, discontinue ripretinib. BP = blood pressure; DBP = diastolic blood pressure; SBP = systolic blood pressure ^(a)Graded per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 4.03

Example 6 Safety of Ripretinib and Impact of Alopecia and Palmar-Plantar Erythrodysesthesia (PPES) on Patient-Reported Outcomes

The safety of ripretinib and the impact of alopecia and palmar-plantar erythrodysesthesia (PPES) on patient-reported outcomes (PROs) of patients treated in the study described in Example 2 herein are described. Ripretinib had a favorable overall safety and tolerability profile in the trial of Example 2. When stratified by alopecia and PPES, patient reported assessments of function, overall health, and overall quality of life were maintained over time. For both alopecia and PPES, onset and maximum severity occurred almost simultaneously, indicating that these events generally did not progressively worsen. Overall, these results suggest that alopecia and PPES are manageable and that ripretinib treatment offsets any negative impact associated with these AEs.

Patient reported outcomes (PROs) were assessed with questions from the EuroQol 5D (EQ 5D 5L) and the European Organization for the Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ C30).

Generalized estimating equation (GEE) models were used in statistical analyses in which: Repeated measures models across visits where the outcome was 1 of the 5 PROs; models were built only for ripretinib patients; for alopecia patients, cycles 1 and 2 were excluded to account for median time of alopecia onset; covariates were sex, alopecia/PPES (yes/no), and Eastern Cooperative Oncology Group (ECOG) score at baseline; and when there was no end date for the AE, it was coded conservatively as having extended to the last visit of the double blind period.

In the ripretinib arm, the most common treatment-emergent adverse event (TEAE) was alopecia (51.8%) and the most common grade ¾ TEAE was anemia (9.4%). The highest severity classification for alopecia is grade 2; therefore, no patients in either arm had grade ¾ alopecia. Alopecia was slightly more common in femalesys males in the ripretinib arm (56.8% vs 43.2%). In the ripretinib arm, 21.2% of patients reported PPES; no patients had grade 3 PPES (grade 3 is the highest severity classification for PPES). There were no serious adverse events of alopecia or PPES reported. Within the ripretinib arm, 7.1%, 23.5%, and 5.9% of patients experienced a TEAE leading to dose reduction, dose interruption, or death, respectively, compared with 2.3%, 20.9%, and 23.3% in the placebo arm. In patients receiving ripretinib, the median worst grade of alopecia occurred very shortly after the median first appearance (FIG. 21). The median first appearance and worst grade of PPES occurred simultaneously in patients receiving ripretinib (FIG. 21).

Table 7 shows a GEE analysis summary of the association between alopecia and PPES with the 5 PRO measures in patients taking ripretinib. In a repeated measures analysis, there was a trend toward an improvement of the 5 PROs among patients with alopecia (Table 7). The presence of alopecia was associated with better self-reported overall quality of life (Table 7). This was statistically significant at P<0.01, but did not exceed the threshold for meaningful change. There was no association between PPES and the 5 PRO measures (Table 7).

TABLE 7 GEE analysis summary of the association between alopecia and PPES with the 5 PRO measures in patients taking ripretinib. Mean Confidence P-value from Mean Estimate Limit ChiSq Alopecia EORTC-QLQ-C30 Overall health 0.17 (−0.10, 0.44) 0.2222 Overall quality of life 0.35 (0.03, 0.67) 0.0313 Physical function 3.17 (−0.29, 6.64) 0.0729 Role function 4.50 (−2.87, 11.87) 0.2310 EQ-5D-5L VAS 3.01 (−0.64, 6.67) 0.1062 PPES EORTC-QLQ-C30 Overall health 0.06 (−0.29, 0.41) 0.7457 Overall quality of life 0.12 (−0.26, 0.50) 0.5368 Physical function 3.03 (−0.92, 6.99) 0.1325 Role function 2.83 (−5.52, 11.17) 0.5070 EQ-5D-5L VAS 1.65 (−2.11, 5.41) 0.3903

Longitudinal graphs out to Cycle 10, Day 1 demonstrate similar trends in mean change from baseline for the 5 PROs for patients receiving ripretinib that developed alopecia or PPES and those that did not (FIGS. 22A, 22B, 22C, 22D, 23A, 23B, 23C, 23D, 24A, and 24B).

TABLE 8 Comparison of double blind and open label data cut time periods. Ripretinib Ripretinib (N = 85) (N = 85) Double-blind cut Open-label cut Progression-Free Survival by BICR Number of events (%) 51 (60) 64 (75) Progressive disease 46 (54) 58 (68) Deaths 5 (6) 6 (7) Median PFS (months) (95% CI) 6.3 (4.6, 6.9) 6.3 (4.6, 8.1) Hazard ratio (95% CI) 0.15 (0.09, 0.25) 0.16 (0.10, 0.27) p-value <0.0001 <0.0001* Overall Response Rate by BICR Overall Response Rate (%) 9 12 (95% CI) (4.2, 18) (5.8, 20.6) p-value 0.0504 0.0156* Overall Survival Number of deaths (%) 26 (31) 38 (45) Median OS (months) (95% CI) 15 (12, 15) Not Reached (13, NE) Hazard ratio (95% CI)/p-value 0.36 (0.21, 0.62)/ 0.43 (0.26, 0.69)/ 0.0004* 0.0014* Exposure Mean in the double blind period 5.6 7.6 (months)

Example 7 Studies of Ripretinib and Compound A with Strong CYP3A Inhibitors

Coadministration of 150 mg QD ripretinib with a strong CYP3A inhibitor increased the exposure of ripretinib and its active metabolite (Compound A), which may increase the risk of adverse reactions. Coadministration of ripretinib with itraconazole (a strong CYP3A inhibitor and also a P-gp inhibitor) increased ripretinib C_(max) by 36% and AUC_(0-inf) by 99% and also increased Compound A AUC_(0-inf) by 99% with no change in its C_(max).

Example 8 Studies of Ripretinib with a Proton-Pump Inhibitor

The effect of a proton-pump inhibitor on the exposure of ripretinib was evaluated. No clinically significant differences in the plasma exposure to ripretinib and Compound A were observed when ripretinib was coadministered with pantoprazole, a proton-pump inhibitor. Although ripretinib has pH-dependent solubility, concomitant administration of 40 mg QD pantoprazole with 150 mg QD ripretinib did not affect ripretinib exposure.

Example 9 Studies of Food Effect on Ripretinib and Compound a Exposure

The effect of a high-fat breakfast on ripretinib and Compound A exposure was evaluated. A high fat meal consisted of approximately 150, 250, and 500-600 calories from protein, carbohydrate, and fat, respectively. Following administration of ripretinib with a high-fat meal at a 150 mg dose, ripretinib AUC_(0-24h) and C_(max) were higher by 30% and 22%, respectively. For the metabolite Compound A, AUC_(0-24h) and C_(max) were higher by 47% and 66%, respectively. The food effect is not considered to be clinically significant based on exposure-response analysis. Therefore, ripretinib may be taken with or without food at approximately same time each day.

Equivalents

Those skilled in the art will recognize, or be able to ascertain, using no more than routine experimentation, numerous equivalents to the specific embodiments described specifically herein. Such equivalents are intended to be encompassed in the scope of the following claims. 

The invention claimed is:
 1. A method of treating a patient suffering from Grade 2 or Grade 3 palmer-planter erythrodysesthesia syndrome while being administered 150 mg ripretinib daily or twice daily for treatment of gastrointestinal stromal tumors, comprising: withholding administration of ripretinib for at least 7 days or until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome then administering to the patient 100 mg daily ripretinib for at least 28 days, if the patient is suffering from Grade 3 palmer-planter erythrodysesthesia syndrome; or if the patient is suffering from Grade 2 palmer-planter erythrodysesthesia syndrome, withholding administration of ripretinib until the patient has less than or equal to Grade 1 palmer-plantar erythrodysesthesia syndrome or baseline; if the patient recovers from the palmer-plantar erythrodysesthesia syndrome within 7 days of withholding administration, then administering to the patient 150 mg daily ripretinib, or if the patient has not recovered, then administering to the patient 100 mg daily ripretinib for at least 28 days.
 2. The method of claim 1, wherein the patient suffers from the Grade 2 or Grade 3 palmer-plantar erythrodysesthesia syndrome while being administered 150 mg ripretinib daily.
 3. The method of claim 1, wherein the patient suffers from the Grade 2 or Grade 3 palmer-plantar erythrodysesthesia syndrome while being administered 150 mg ripretinib twice daily. 